This is a demonstration conducted for a local transportation company using their ATF Oil and our GLW FS50 oil Filtration System. We added carbon black to completely clean ATF Oil to our demonstration system and you can see in the video that the light blue ATF oil turns black after the carbon black is added. After about 30 minutes of cleaning, the ATF oil returns to its original light blue color, indicating the oil has been successfully cleaned. See the video of the demonstration below.